(((((((Froggie)))))))
Sending you strength and the comfort of knowing that you have found your witnesses. ...and as long as I have life, I will not stop trying, either. You don't need to carry the burden of your knowledge anymore...your struggles have lit the flames and burn through us. You can put that energy into your life, fully now.
Your children's contact with your sis sounds like it might be dredging up the feelings of what it felt like when you were with your family, but your children are not likely to endure the same thing. They've had the benefit of *seeing* someone handling people like that....their Mom! :>
I suspect they'll recognize it far sooner, and the lesson to your sister will get in response will ring far deeper when it's the next generation who confronts her with the effects of her own behavior. Easy to dismiss our siblings but other people...not so easy.
Maybe they'll bring her some healing, who knows? Anything is possible...but regardless, hoping you can set the worries aside for at least a time.